Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc36ee37c2ec356…

MALICIOUS

PDF

43.7 KB Created: 2020-08-10 05:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd3f6f6d99cb013cda93b0bd9d347bbd SHA-1: 7e4cf356047d8eba2bfec5e40462b41f6e3d1d6a SHA-256: ecc36ee37c2ec3566323da56e0da8a84536155c0b30cc37cc9fca4ca1041e901
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.ru/pify. The document body, though heavily obfuscated, contains the same URL and references to 'addition and subtraction of unlike fractions worksheets pdf', likely a lure to disguise the malicious intent. No scripts were extracted, but the primary attack pattern involves redirecting the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=addition+and+subtraction+of+unlike+fractions+worksheets+pdf
    • http://files.killjoy.info/uploads/1/3/2/8/132816158/444fa6d86d0810f.pdf
    • http://files.braddocksbattlefield.com/uploads/1/3/2/7/132712115/jamijovugivepi.pdf
    • http://files.aaavc.net/uploads/1/3/0/8/130874567/sujudifitesiduvome.pdf
    • http://files.greenvalleygrowers.com/uploads/1/3/0/8/130813769/1671cea871b.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/african_charter_on_human_and_peoples_rights_1981.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/91169072627.pdf
    • https://cdn.shopify.com/s/files/1/0438/2192/4514/files/10405763155.pdf
    • https://cdn.shopify.com/s/files/1/0440/2987/0230/files/63914519805.pdf
    • https://cdn.shopify.com/s/files/1/0428/7810/7811/files/almost_is_never_enough_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/74424078099.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/luxulowoxesujokotom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1396/files/68416465538.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/14471004130.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4246/files/tikeratonokovexer.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/ftce_math_5-_9_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/zitidedomogo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/definition_of_play_in_early_childhood_education.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cd1.bin
98ecedbe4b0479f1be00eced976c846926594628192b974152716f6b625c0883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD1 5528 bytes
font_01_sfnt_off00007fab.bin
689b72df81fee092f9f9fda1906f6130336d5cd871f1a84cb06da095a30545e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAB 9896 bytes

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